a.k.a. Brands Holding Corp. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Equity-based Compensation - Narrative (Details)

Equity-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended	15 Months Ended	48 Months Ended
	Jan. 31, 2025 tranche $ / shares shares	May 31, 2024 tranche $ / shares shares	Sep. 30, 2023 tranche $ / shares shares	Sep. 30, 2021 shares	Mar. 31, 2026 USD ($) tranche $ / shares shares	Mar. 31, 2022	Mar. 31, 2026 USD ($) tranche $ / shares shares	Dec. 31, 2025 $ / shares	May 22, 2024 shares	May 30, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					0
Grant date fair value (in dollars per share) \| $ / shares					$ 88.15		$ 88.15	$ 81.47
Options, intrinsic value (in dollars per share) \| $ / shares					$ 0
Unrecognized compensation cost \| $					$ 0.0		$ 0.0
Wesley Bryett
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)					0
Options, intrinsic value (in dollars per share) \| $ / shares					$ 0
Unrecognized compensation cost \| $					$ 0.6		0.6
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	100,000				0
Unrecognized compensation cost \| $					$ 0.7		$ 0.7
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				10 years
Stock options \| Wesley Bryett
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
Granted (in shares)			416,667
Number of tranches \| tranche			4
Grant date fair value (in dollars per share) \| $ / shares			$ 109.27
Requisite service period			5 years 6 months
Weighted average period					3 years
Stock options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Number of tranches \| tranche	4
Grant date fair value (in dollars per share) \| $ / shares	$ 120.00
Weighted average period	4 years 2 months 12 days				2 years 10 months 24 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period					1 year 8 months 12 days
Vesting period						4 years	3 years
Unrecognized compensation cost \| $					$ 5.7		$ 5.7
2021 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in shares)				408,355	2,768,771		2,768,771		1,100,000	833,333
Annual increase of shares authorized for issuance				1.00%
2021 Employee Stock Purchase Plan \| ESPP purchase rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in shares)				102,088	422,475		422,475
Annual increase of shares authorized for issuance				1.00%
Offering period				6 months
Percentage on share price issued				85.00%
Interim CEO Award \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period		5 years
Granted (in shares)		150,000
Number of tranches \| tranche		10
Grant date fair value (in dollars per share) \| $ / shares		$ 29.50
Requisite service period		2 years 10 months 24 days
Weighted average period					1 year 6 months
Number of tranches \| tranche					2		2
Total unrecognized compensation cost \| $					$ 0.1		$ 0.1